Update Content 0.49.0

Ⅰ. Plugin System
The plugins in the edit mode map can finally be circulated among maps. You can pack plugins that can be used freely in different developer maps and can be uploaded to the resource gallery.
Ⅱ. Shop
1. Transformer skin-Snarl
2. 15 new avatars
Ⅲ. Function Optimized
Ⅳ. Bug fixed